package com.hr.web;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
 
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.hr.pojo.Admin;
import com.hr.pojo.Upload;
import com.hr.service.AdminService;
import com.hr.service.UploadService;
import com.hr.service.impl.AdminServiceImpl;
import com.hr.service.impl.UploadServiceImpl;

import com.hr.utils.StringUtil;

import java.net.URLEncoder;

public class UploadServlet extends BaseServlet{
    private static final long serialVersionUID = 1L;
	private UploadService uploadService=new UploadServiceImpl();
	private AdminService adminService=new AdminServiceImpl();
    // 上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "upload";
 
    // 上传配置
    private static final int MEMORY_THRESHOLD   = 1024 * 1024 * 3;  // 3MB
    private static final int MAX_FILE_SIZE      = 1024 * 1024 * 40; // 40MB
    private static final int MAX_REQUEST_SIZE   = 1024 * 1024 * 50; // 50MB
    
    /**
     * 上传数据及保存文件
     */
    public String upload(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
        // 检测是否为多媒体上传
        if (!ServletFileUpload.isMultipartContent(request)) {
            // 如果不是则停止
            PrintWriter writer = response.getWriter();
            writer.println("Error: 表单必须包含 enctype=multipart/form-data");
            writer.flush();
            return null;
        }
 
        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();
        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(MEMORY_THRESHOLD);
        // 设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
 
        ServletFileUpload upload = new ServletFileUpload(factory);
         
        // 设置最大文件上传值
        upload.setFileSizeMax(MAX_FILE_SIZE);
         
        // 设置最大请求值 (包含文件和表单数据)
        upload.setSizeMax(MAX_REQUEST_SIZE);
        
        // 中文处理
        upload.setHeaderEncoding("UTF-8"); 

        // 构造临时路径来存储上传的文件
        // 这个路径相对当前应用的目录
        String uploadPath = getServletContext().getRealPath("/")  + UPLOAD_DIRECTORY;
         
        // 如果目录不存在则创建
        File uploadDir = new File(uploadPath);
        if (!uploadDir.exists()) {
            uploadDir.mkdir();
        }
        try {
            // 解析请求的内容提取文件数据
            @SuppressWarnings("unchecked")
            List<FileItem> formItems = upload.parseRequest(request);
            List<String> pList = new ArrayList<>();
            if (formItems != null && formItems.size() > 0) {
                // 迭代表单数据
                Upload upload_sql = new Upload();
                Admin admin=(Admin) request.getSession().getAttribute("admin");
                for (FileItem item : formItems) {
                    // 处理不在表单中的字段
                    if (!item.isFormField()) {
                    	long time=System.currentTimeMillis();
                        //获取文件的原始名称
                        String originalFilename = new File(item.getName()).getName();//timg (1).jpg
                        //获取文件的后缀名 .jpg
                        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
                        
                        //String fileName = new File(item.getName()).getName();
                    	String fileName = StringUtil.stringToMD5("file"+time)+suffix;
                        String filePath = uploadPath + File.separator + fileName;
                        File storeFile = new File(filePath);
                        // 在控制台输出文件的上传路径
                        System.out.println(UPLOAD_DIRECTORY+File.separator+fileName);
                        // 保存文件到硬盘
                        item.write(storeFile);
                        //设置url
                        upload_sql.setUrl(UPLOAD_DIRECTORY+File.separator+fileName);                       
                        
                    }else {
                    	String value = item.getString("UTF-8");
                    	pList.add(value);//将非文件的其他参数放到一个list中，后面可以顺序的去取到
                    }
                }

                upload_sql.setName(pList.get(1));

                upload_sql.setContent(pList.get(2));
                System.out.println(pList);
                upload_sql.setUser(admin.getId().toString());
                uploadService.saveUpload(upload_sql);
                
            }
        } catch (Exception ex) {
    		response.setContentType("text/html;charset=utf-8");
            request.getRequestDispatcher("./public/alert.jsp").include(request, response);
            PrintWriter out = response.getWriter();
            out.println("<script>no_alert(\"上传失败"+ex.getMessage()+"\",\"main.jsp?method=indexUpload&servlet=UploadServlet\");</script>");

        }
   		response.setContentType("text/html;charset=utf-8");
        request.getRequestDispatcher("./public/alert.jsp").include(request, response);
        PrintWriter out = response.getWriter();
        out.println("<script>ok_alert(\"上传成功\",\"main.jsp?method=indexUpload&servlet=UploadServlet\");</script>");
        return null;
    }
    public String indexUpload(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");  
		request.getRequestDispatcher("/user/upload.jsp").include(request, response);
    	return null;    	
    }
    
    public String listUpload(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");  
		List uploadList= uploadService.findAllUploads();
		request.setAttribute("uploadList", uploadList);
		request.getRequestDispatcher("/user/listupload.jsp").include(request, response);
    	return null;    	
    }
    public String DownLoad(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
    	String file = request.getParameter("file");	
    	String name = new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");;	
    	String now  = request.getParameter("now");	
    	System.out.println(name);
    	response.addHeader("content-Type", "application/octet-stream");
    	
    	String agent = request.getHeader("User-Agent");
    	
    	 if(agent.toLowerCase().indexOf("chrome")>0)
    	{
    		response.addHeader("content-Disposition", "attachment;filename="+new String((name+"."+now).getBytes("UTF-8"), "ISO8859-1"));
    	}
    	else
    	{
    		response.addHeader("content-Disposition", "attachment;filename="+URLEncoder.encode((name+"."+now), "UTF-8"));
    	}
    	InputStream in = getServletContext().getResourceAsStream("./upload/"+file+"."+now);
    	ServletOutputStream out = response.getOutputStream();
    	byte[] bs=new byte[1024];
    	int len=-1;
    	while((len=in.read(bs))!=-1)
    	{
    		out.write(bs,0,len);
    	}
    	out.close();
    	in.close();
		return null;

    }
    
}
